#include<stdio.h>

int main()
{
 	char grade;
 	scanf("%c",&grade);
 	printf("Your score:");
 	switch(grade)
 	{
 		case'A':printf("85~100\n");break;
 		case'B':printf("70~84\n");break;
 		case'C':printf("60~69\n");break;
 		case'D':printf("<60\n");break;
 		default:printf("enter daea error!\n");
	 }
 	return 0;
}

